Fuel saving furnace



Oct. 14, 1952 s, WALD 2,613,653

FUEL SAVING FURNACE Filed Aug. 20, 1951 2 SI'IEETS-SI'IEET l JNVENTOR.SAMUEL WALD BY If;

Oct. 14, 1952 WALD 2,613,653

FUEL SAVING FURNACE Filed Aug. 20, 1951 2 SHEETSSHEET 2 IN VEN TOR.SAMUEL WALD Patented Oct. 14, 1952 NITED STA-T ES PATENT OFFICE-2,613,653" Fest SAVING cosmon- Samuel wald, meme. N. Y. plicationAugust-20, 195'i', seflaiNt; 242,61 9

4 Claims. (Cl. 122-20) The present invention relates-to new and use fulimprovements in aheatirig system:

In converting coal burning furnaces of heating systems to be oil or gasfired, the ash pit which heating Water for washing, bathing anstheiike'purposes. The present invention proposes mounting a pre-heating' coilwithin theash pit and within which pre-heating-coil' the water ispre-heated before being fed intothe boilercoil in a manner to employtheheat which collects within the ash pit for a useful purpose;

The heating system inaccordance with the present invention includes aboiler within which the hot water is collected until used andit'is-proposed to connectthe pre-heating coil and the boiler'coil inseries with the storag'e tank for the hot water in a manner sotthat coldwater entering the tank at the bottom to replace the hot water which isdrawn'off at the .bOppWillbC freeto continuously circulate firstthroughtheme-=- heater coil and then through the boiler coil an'd theback into the tank as completely heated water. Another object of thepresent invention proposes arranging the pre-heating coil within the ashpit in a manner to obtain more'hotwater in a shorter time with aconsiderable savingin fuel. a

Still further, the present invention proposes an arrangement wherebyhotwater from the-hot water storage tank can be feddirectly into theboiler of the heating systemto replace the'boiledaway water in a. mannerto improve the efficie'ncy of the boilerin supplyingsteam forheatingpurposes by shortening the time required for steam' generationwhen the supply of waterrin the boiler is replenished.

It is a further object of'the'present invention to provide an improved}hot wat'er heating are rangement for. a converted furnace boiler-whichis simple and durable,,which is efficient for its intended purposes andwhich can be constructedand. installed at reasonable costs.

For further comprehension of the invention. and of the objects andadvantagesthereof,reference will be had to the following descriptionandaccompanyingidrawings.and to the. appended claims in which the variousnovel features ofithe invention are more particularlvset forth;

systemof the present invention with the furnace shown in verticalsection} Fig. 2 is a horizontal sectionalyiew taken sub-- Fig. 3 isapar'tial vertical sectionalview taken:

substantially on theline of Fig; 1.

The converted heating system. in accordance with the present invention;includes a furnace I it having'lan outer housing H rested down onthefloor l2 over'a conventional collecting'pit-i a. The outer housingl'l'of thefurr'iace IEI encloses: a centrally located firebo'x- Mforming-a boiler space [5 within the housing H and completelysurrounding the firebox W for containing-boiler water: The ncrmar ieveif the boiler water within the boiler space 15 isindicated' in Fig. lby'the' dot'and dash lines 'A. Mountedon the front wall of the housing11 there isthe usual gauge l6- in which the levelof the boiler water canbe seen. Within the housing H, the fire box M has a forwardly'extendedthroat" portion I l which surrounds a. front opening I! in the frontwall of the housing" If through which coal was passed intothefurnacei'llwh'e'n the san'i'e was'co'al fired. Anon burner l8'has itsflamedischarging portion extended through the" opening I? and the throatportion M so as to discharge' its name into the interior of the are boxL4; The oil burner? [8 ism'ounted 011' a-platforih l fi-built-up withinthe ash pit l3 and carries 'aplate zfl'b olted to the outer face of thehousing H"; see Fig.1, closing-the frontopening l'l. The-plate EUreplacBS theusii'al 'p'ivotally mounted rumace door which has beenremoved. I

The bottomcf the boiler space id-is closed by aheavy gauge metal plate 2iwhichis welded to the bottomedges of the housing i hand" thebottomedges of theiire'box i l, see 'Figs. l andl3.

are formed of suitably shaped flat plates all Welded together and withthe material ofthe throat portion l i being we'ldedto the innerfa'ce ofthe front wall of the housing H; All interior opens" to' the ash pit13'; however, the inner" peripheral edges of the plate 2| extendpartially inward across the" open bottomfofthefireboxl4 forming a; ledgeupon which the refractory material" 22 is supported, aliasbest shown inThe crown" sheet of theme" btix" l4 and the refractory material 22lining the inner face of that crown sheet are formed with an opening 23for the discharge of combustion gases from the interior of the fire boxI4. Mounted within the housing II of the furnace I0, there is a heatexchange unit 24 which provides a tortuous path for the exhaustedcombustion gases from the opening 23 to the flue pipe 25 which risesfrom the rear of the housing II. The boiler water within the boilerspace I circulates about the heat exchange unit 2I and the fire box I4to be heated thereby to the boiling point to give off steam. Mountedwithin an opening in the rear of the boiler housing II, there is aconnector member 26 to which the heat exchange unit 24 is connectedwithin the housing and to which the flue pipe is connected exteriorly ofthe housing.

Extending from the top of the housing I I, there is a steam dischargepipe 21 for conveying steam from the interior of .the housing -to beused for heating and the like purposes. Also, mounted through the topwall of the housing II there is the usual safety valve 28'.

Located within the boiler space I5 closely adjacent the top level of thewater in that space, there is a water heating coil 29. The coil 29 isprovided for heating water .to be" used for washing, bathing and thelike purposes. The discharge end of the heating coil 29is connected to apipe 30 for conveying the heated water from the coil to the usual hotwater storage tank 3I positioned adjacent the furnace I0. Extending fromthe top of the tank 3I, there is a pipe 32 for conveying the hot waterto the points where it is to be usedthe kitchen sink, bathroom or thelike. .A pipe 33 connected at one end to a source of city water has itsother end connected to the bottom of thetank 3| so as to replace the hotwater which is drawn off the top of the tank. If desired, the pipe 33can be furnished with a normally open valve for shutting off the supplyof city water in cases, of emergency--for example, when the tank 3|develops a leak or for other reasons.

Mounted within the ash pit I3 directly below the housing I I there is anash collector casing 34 which is open at the front of the furnace forremoval of the ashes when the furnace is coal fired. Mounted within thatcasing 34 there is a pre-heating coil 35 comprised of three adjacentserially connected spirally wound coil sections, as best shown in Figs.2 and 3. Extending from the bottom of the tank 3| there isa pipe 36which is extended through the rear wall of the casing 34 and connectedat the entrance end of the preheating coil 35. Cold water from thebottom of the tank 3| passes through the pipe 36 and then into andthrough the pre-heating coil 35. Within that coil, the cold water ispre-heated by the heat from the oil burner which passes down into thecasing 34 through the open bottom of the fire box I4.

The discharge end of the coil 35 is connected to a discharge pipe 31.The pipe 31 is passed out through the rear of the casing 34, upwardalong the rear of the housing II and is then extended through the rearwall of the housin II where it is connected to the entrance end of thecoil 29. The pre-heated water then passes through the coil 29 Where itis brought to the desired temperature and then discharges through thepipe 30 back into the tank 3|. The tank 3 I, the pipe 36, thepre-heating coil 35, the pipe 31, the coil 29, and the pipe 30 back tothe tank 3I form a closed circuit for causing the cold water pipe 39extends.

to be drawn from the bottom of the tank 3| to be circulated through thecoils 35 and 29 to be thoroughly heated and then discharged back intothe top of the tank as fully heated water. The utilization of thepre-heating coil 35 within the ash collector casing 34 makes it possibleto derive maximum benefit from the heat which is normally dissipatedfrom the casing 34. Thus, the improved system makes it possible toquickly obtain a good supply of hot water with a maximum saving in fueloil.

Connected in the pipe 32 above the top of the tank 3I, there is aT-connector 38 from which a The other end of the pipe 39 discharges intothe boiler space I5 through the top wall of the housing II. Mounted inthe pipe 39, there is a normally closed manually operable valve 40. Whenthe valve 40 is opened, hot water from the top of the tank 3I will flowinto the top of the boiler space I5 to replace the boiler water which isboiled away by normal use of the furnace IO. Using the hot water fromthe tank 3I to replace the boiler water makes it possible to morequickly obtain steam from the furnace as the water of the furnace is notchilled as would be the case if cold city water were used forreplenishing the supply of boiler water.

In the foregoing description, the features of the present invention aredescribed as applied to a furnace which has been converted to operate asan oil burner which previously operated as a coal furnace. However, itis appreciated that the teachings of the present invention are equallywell adapted for application in a heating system converted to operate ongas or any other type of fuel which leaves no residue to collect withinthe ash collector casing 34 previously used for collecting the asheswhich remained from the burned coal. v v

While I have illustrated and described the preferred embodiment of myinvention, it is to be understood-that I do not limit myself to theprecise construction herein disclosed and the right is reserved to allchanges and modifications coming within the scope of the invention asdefined in the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by United States Letters Patent is:

1. A heating system comprising a furnace having a fire box surrounded bya spaced housing for containing boiler water, said fire box openingashpit below said furnace, a casing mounted within said ashpit, a waterheating coil mounted within said spaced housing, a hot Water tankpositioned along side of said furnace and connected at its bottom end toa source of cold Water to be heated and having an exit pipe at its topend for conveyin heated water to points where it is to be vconsumed, apro-heating coilmounted within said casing below the open bottom of saidfire box, a pipe connecting the bottom of said tank to the entrance endof said pro-heating coil, 3, pipeconnecting the discharge end of saidpre-heating-coil to the entrance end of said first-mentioned coil, and apipe connecting the exit end of said first-mentioned coil to dischargethe heated water back into the top of said tank.

2. A heating system comprising a furnace having a firebox surrounded bya spaced housing for containing boiler water, said fire box opening atitsbottor'n; an ashpit' below said furnace, a casing mountedwith'in saidashpit, a water heating coil mounted within said spaced housing, a

hot water tank positioned along side of said furnace and connected atits bottom end to a source of cold water to be heated and havin an exitpipe at its topend'for conveying heated water to points where it is tobe consumed, a pre-heating coil mounted within said casing below the.open bottom of said fire box, a pipe connecting.

the bottom of said tank to the entrance end of said pre-heating coil, apipe connecting the discharge end of saidpre-heating coil to the entrance end of said first-mentioned coil, and a pipe connecting theexitend of said first-mentioned coil to discharge theheated water backinto the top of said tank, said pro-heating coil being comprised ofthree adjacent serially connected spirally wound coil sections.

3. A heating system comprising a furnace having a fire box surrounded bya spaced housing for containing boiler water, said fire box open- 4. Aheating system comprising a furnace having a fire box surrounded by aspaced housing for containin boiler water, said fire box opening at itsbottom, an ashpit belowsaid furnace, a casin mounted within said ashpit,a water heating coil mounted within said spaced housing, a hot watertank positioned along side of said furnace and connected at its bottomend to a source of cold water to be heated and having an exit pipe atits top end for conveying heated water to points where it is to beconsumed, a pre-heating coil mounted within said casing below the openbottom of said fire box, a pipe connecting the bottom of said tank tothe entrance end of said pre-heating coil, a pipe connecting thedischarge end of said pre-heating coil to the entrance end of saidfirst-mentioned coil, and a pipe connecting the exit end of saidfirst-mentioned coil to discharge the heated water back into the top ofsaid tank, a T-connector mounted in said exit pipe from said tank, and9, pipe connected to said T-connector and having its other end connectedto the top of said furnace for conveying heated water from said tank tothe space of said furnace for replacing the boiled away 7 boiler water,and a normally closed manually oping coil mounted within said casingbelow the open bottom of said fire box, a pipe connecting the bottom ofsaid tank to the entrance end of said pre-heating coil, a pipeconnecting the discharge end of said pre-heating coil to the entranceend of said first-mentioned coil, and a pipe connecting the exit end ofsaid first-mentioned coil to discharge the heated water back into thetop of said tank, a T-connector mounted in said exit pipe from saidtank, and a pipe connected to said T-cozmeotor and having its other endconnected to the top of said furnace for conveying heated water fromsaid tank to the space of said furnace for replacing the boiled awayboiler water.

erable valve mounted in said last-mentioned pipe for controlling thefiow of water from said tank into said space of said furnace. 1

SAMUEL WALD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 359,672 Galligan Mar. 22, 18871,301,156 Muhlfeld Apr. 22, 1919 1,958,736 Barrow May 15, 1934 2,037,019Hall Apr. 14, 1936

